The processes of formation inorganic salts in the bottomhole formation zone contribute to the deterioration of its filtration-capacity properties and significantly reduce the productivity of oil producing wells. Analysis of the studies made it possible to identify the main indicators on which the decrease in the permeability of rocks due to salt deposition during water-flooding mainly depends. The paper proposes a thermodynamic model developed to predict the processes of salt deposition in the bottomhole zone of oil producing wells.